I gave Skittles 3oz of wet food with like 2 of the spoons of KMR. I got the more liquid of the wet food drainned it in a bowl and mixed it with that juice then I added to the food. She would not drink KMR milk unless I snuck it in to her food using the powder. I doubt there is a limit. I know I fed this to Skittles 3x a day. She was nursing a lot of kittens. If your mom is willing to eat it in the food give it to her. Just make sure she does poop. Wet food does provide a lot of the water they need.